<?php
namespace lemon\widgets\ueditor;
use Yii;

class Uploader
{
	private $fileField; //文件域名
	private $file; //文件上传对象
	private $base64; //文件上传对象
	private $config; //配置信息
	private $oriName; //原始文件名
	private $fileName; //新文件名
	private $fullName; //完整文件名,即从当前配置目录开始的URL
	private $filePath; //完整文件名,即从当前配置目录开始的URL
	private $fileSize; //文件大小
	private $fileType; //文件类型
	private $stateInfo; //上传状态信息,
	private $stateMap = array( //上传状态映射表，国际化用户需考虑此处数据的国际化
		"SUCCESS", //上传成功标记，在UEditor中内不可改变，否则flash判断会出错
		"文件大小超出 upload_max_filesize 限制",
		"文件大小超出 MAX_FILE_SIZE 限制",
		"文件未被完整上传",
		"没有文件被上传",
		"上传文件为空",
		"ERROR_TMP_FILE"		   => "临时文件错误",
		"ERROR_TMP_FILE_NOT_FOUND" => "找不到临时文件",
		"ERROR_SIZE_EXCEED"		=> "文件大小超出网站限制",
		"ERROR_TYPE_NOT_ALLOWED"   => "文件类型不允许",
		"ERROR_CREATE_DIR"		 => "目录创建失败",
		"ERROR_DIR_NOT_WRITEABLE"  => "目录没有写权限",
		"ERROR_FILE_MOVE"		  => "文件保存时出错",
		"ERROR_FILE_NOT_FOUND"	 => "找不到上传文件",
		"ERROR_WRITE_CONTENT"	  => "写入文件内容错误",
		"ERROR_UNKNOWN"			=> "未知错误",
		"ERROR_DEAD_LINK"		  => "链接不可用",
		"ERROR_HTTP_LINK"		  => "链接不是http链接",
		"ERROR_HTTP_CONTENTTYPE"   => "链接contentType不正确"
	);
	/**
	 * 构造函数
	 * @param $fileField  表单名称
	 * @param $config 配置项
	 * @param string $type 是否解析base64编码，可省略。若开启，则$fileField代表的是base64编码的字符串表单名
	*/
	public function __construct($fileField, $config, $type = "upload"){
		$this->fileField = $fileField;
		$this->config = $config;
		$this->type = $type;
		if ($type == "remote") {
			$this->saveRemote();
		} else if ($type == "base64") {
			$this->upBase64();
		} else {
			$this->upFile();
		}
		//		$this->stateMap['ERROR_TYPE_NOT_ALLOWED'] = iconv('unicode', 'utf-8', $this->stateMap['ERROR_TYPE_NOT_ALLOWED']);
	}
	/**
	 * 上传文件的主处理方法
	 * @return mixed
	 */
	private function upFile(){
		$file = $this->file = $_FILES[$this->fileField];
		if (!$file) {
			$this->stateInfo = $this->getStateInfo("ERROR_FILE_NOT_FOUND");
			return;
		}
		if ($this->file['error']) {
			$this->stateInfo = $this->getStateInfo($file['error']);
			return;
		} else if (!file_exists($file['tmp_name'])) {
			$this->stateInfo = $this->getStateInfo("ERROR_TMP_FILE_NOT_FOUND");
			return;
		} else if (!is_uploaded_file($file['tmp_name'])) {
			$this->stateInfo = $this->getStateInfo("ERROR_TMPFILE");
			return;
		}
		$this->oriName = $file['name'];
		$this->fileSize = $file['size'];
		$this->fileType = $this->getFileExt();
		$this->fullName = $this->getFullName();
		$this->filePath = $this->getFilePath();
		$this->fileName = $this->getFileName();
		$dirname = dirname($this->filePath);
		//检查文件大小是否超出限制
		if (!$this->checkSize()) {
			$this->stateInfo = $this->getStateInfo("ERROR_SIZE_EXCEED");
			return;
		}
		//检查是否不允许的文件格式
		if (!$this->checkType()) {
			$this->stateInfo = $this->getStateInfo("ERROR_TYPE_NOT_ALLOWED");
			return;
		}
		//创建目录失败
		if (!file_exists($dirname) && !mkdir($dirname, 0777, true)) {
			$this->stateInfo = $this->getStateInfo("ERROR_CREATE_DIR");
			return;
		} else if (!is_writeable($dirname)) {
			$this->stateInfo = $this->getStateInfo("ERROR_DIR_NOT_WRITEABLE");
			return;
		}
		//移动文件
		if (!(move_uploaded_file($file["tmp_name"], $this->filePath) && file_exists($this->filePath))) { //移动失败
			$this->stateInfo = $this->getStateInfo("ERROR_FILE_MOVE");
		} else { //移动成功
			$this->stateInfo = $this->stateMap[0];
		}
	}
	/**
	 * 处理base64编码的图片上传
	 * @return mixed
	 */
	private function upBase64(){
		$base64Data = $_POST[$this->fileField];
		$img = base64_decode($base64Data);
		$this->oriName = $this->config['oriName'];
		$this->fileSize = strlen($img);
		$this->fileType = $this->getFileExt();
		$this->fullName = $this->getFullName();
		$this->filePath = $this->getFilePath();
		$this->fileName = $this->getFileName();
		$dirname = dirname($this->filePath);
		//检查文件大小是否超出限制
		if (!$this->checkSize()) {
			$this->stateInfo = $this->getStateInfo("ERROR_SIZE_EXCEED");
			return;
		}
		//创建目录失败
		if (!file_exists($dirname) && !mkdir($dirname, 0777, true)) {
			$this->stateInfo = $this->getStateInfo("ERROR_CREATE_DIR");
			return;
		} else if (!is_writeable($dirname)) {
			$this->stateInfo = $this->getStateInfo("ERROR_DIR_NOT_WRITEABLE");
			return;
		}
		//移动文件
		if (!(file_put_contents($this->filePath, $img) && file_exists($this->filePath))) { //移动失败
			$this->stateInfo = $this->getStateInfo("ERROR_WRITE_CONTENT");
		} else { //移动成功
			$this->stateInfo = $this->stateMap[0];
		}
	}
	/**
	 * 拉取远程图片
	 * @return mixed
	 */
	private function saveRemote(){
		$imgUrl = htmlspecialchars($this->fileField);
		$imgUrl = str_replace("&amp;", "&", $imgUrl);
		//http开头验证
		if (strpos($imgUrl, "http") !== 0) {
			$this->stateInfo = $this->getStateInfo("ERROR_HTTP_LINK");
			return;
		}
		//获取请求头并检测死链
		$heads = get_headers($imgUrl);
		if (!(stristr($heads[0], "200") && stristr($heads[0], "OK"))) {
			$this->stateInfo = $this->getStateInfo("ERROR_DEAD_LINK");
			return;
		}
		//格式验证(扩展名验证和Content-Type验证)
		$fileType = strtolower(strrchr($imgUrl, '.'));
		if (!in_array($fileType, $this->config['allowFiles']) || stristr($heads['Content-Type'], "image")) {
			$this->stateInfo = $this->getStateInfo("ERROR_HTTP_CONTENTTYPE");
			return;
		}
		//打开输出缓冲区并获取远程图片
		ob_start();
		$context = stream_context_create(
			array('http' => array(
				'follow_location' => false // don't follow redirects
			))
		);
		readfile($imgUrl, false, $context);
		$img = ob_get_contents();
		ob_end_clean();
		preg_match("/[\/]([^\/]*)[\.]?[^\.\/]*$/", $imgUrl, $m);
		$this->oriName = $m ? $m[1] : "";
		$this->fileSize = strlen($img);
		$this->fileType = $this->getFileExt();
		$this->fullName = $this->getFullName();
		$this->filePath = $this->getFilePath();
		$this->fileName = $this->getFileName();
		$dirname = dirname($this->filePath);
		//检查文件大小是否超出限制
		if (!$this->checkSize()) {
			$this->stateInfo = $this->getStateInfo("ERROR_SIZE_EXCEED");
			return;
		}
		//创建目录失败
		if (!file_exists($dirname) && !mkdir($dirname, 0777, true)) {
			$this->stateInfo = $this->getStateInfo("ERROR_CREATE_DIR");
			return;
		} else if (!is_writeable($dirname)) {
			$this->stateInfo = $this->getStateInfo("ERROR_DIR_NOT_WRITEABLE");
			return;
		}
		//移动文件
		if (!(file_put_contents($this->filePath, $img) && file_exists($this->filePath))) { //移动失败
			$this->stateInfo = $this->getStateInfo("ERROR_WRITE_CONTENT");
		} else { //移动成功
			$this->stateInfo = $this->stateMap[0];
		}
	}
	/**
	 * 上传错误检查
	 * @param $errCode
	 * @return string
	 */
	private function getStateInfo($errCode){
		return !$this->stateMap[$errCode] ? $this->stateMap["ERROR_UNKNOWN"] : $this->stateMap[$errCode];
	}
	/**
	 * 获取文件扩展名
	 * @return string
	 */
	private function getFileExt(){
		return strtolower(strrchr($this->oriName, '.'));
	}
	/**
	 * 重命名文件
	 * @return string
	 */
	private function getFullName(){
		//替换日期事件
		$t = time();
		$d = explode('-', date("Y-y-m-d-H-i-s"));
		$format = $this->config["pathFormat"];
		$format = str_replace("{yyyy}", $d[0], $format);
		$format = str_replace("{yy}", $d[1], $format);
		$format = str_replace("{mm}", $d[2], $format);
		$format = str_replace("{dd}", $d[3], $format);
		$format = str_replace("{hh}", $d[4], $format);
		$format = str_replace("{ii}", $d[5], $format);
		$format = str_replace("{ss}", $d[6], $format);
		$format = str_replace("{time}", $t, $format);
		//过滤文件名的非法自负,并替换文件名
		$oriName = substr($this->oriName, 0, strrpos($this->oriName, '.'));
		$oriName = preg_replace("/[\|\?\"\<\>\/\*\\\\]+/", '', $oriName);
		$format = str_replace("{filename}", $oriName, $format);
		//替换随机字符串
		$randNum = rand(1, 10000000000) . rand(1, 10000000000);
		if (preg_match("/\{rand\:([\d]*)\}/i", $format, $matches)) {
			$format = preg_replace("/\{rand\:[\d]*\}/i", substr($randNum, 0, $matches[1]), $format);
		}
		$ext = $this->getFileExt();
		return $format . $ext;
	}
	/**
	 * 获取文件名
	 * @return string
	 */
	private function getFileName(){
		return substr($this->filePath, strrpos($this->filePath, '/') + 1);
	}
	/**
	 * 获取文件完整路径
	 * @return string
	 */
	private function getFilePath(){
		$fullname = $this->fullName;
		$rootPath= Yii::$app->params['FILE_PHYSICAL_PATH'];
		//$rootPath = isset($this->config['uploadFilePath'])&&!empty($this->config['uploadFilePath'])?$this->config['uploadFilePath']:$_SERVER['DOCUMENT_ROOT'];
		if (substr($fullname, 0, 1) != '/') {
			$fullname = '/' . $fullname;
		}
		return $rootPath . $fullname;
	}
	/**
	 * 文件类型检测
	 * @return bool
	 */
	private function checkType(){
		return in_array($this->getFileExt(), $this->config["allowFiles"]);
	}
	/**
	 * 文件大小检测
	 * @return bool
	 */
	private function  checkSize(){
		return $this->fileSize <= ($this->config["maxSize"]);
	}
	/**
	 * 获取当前上传成功文件的各项信息
	 * @return array
	 */
	public function getFileInfo(){
		return array(
			"state"	=> $this->stateInfo,
			"url"	  => Yii::$app->params['FILE_HTTP_PATH']['local'].$this->fullName,
			"title"	=> $this->fileName,
			"original" => $this->oriName,
			"type"	 => $this->fileType,
			"size"	 => $this->fileSize
		);
	}
}
